Air-thrust propeller for boats.



C. E. RIEDEL.

AIR THRUST PROPELLER FOR BOATS. APPLICATION FILED APR.29, |915.

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Patented Apr. 25, 1916 M @kvm/ML, M

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Application filed April 219, 19115. Serial No. www.

To all when?, t may concern i 'Be it known that I, CHARLES EowanqRIEDEL, citizen of the United Statesyresiding at Detroit, county ofWayne, State-of tcation z-lFigure l,

Michigan, have invented a certain new vahd A useful Improvement inAir-Thrust I Proand declare the followving to be a full, clear,- andexact description pellers for Boats,

of the same, such `as Will enable others skilled in the art to which itpertains to make and use the same, reference being had to theaccompanying4 drawings, which form a `part of lthis specification.

My invention relates toan airthrust propeller for boats :shown in theaccompanying drawings and more particularly pointed out inthe followingspecification and claims.

The s o-called air thrustv propeller -for boats is being readily adoptedin localities abounding 1n shallow streams or. upon inland lakes havingweeds apt to become entangled in the submerged propellers of small,

launches. It has been found, however, that the submerged ruddersemployed in connection with air thrustpropellers are objectionable whenpassing through water .overrun with weeds, or when landing at a bank linshallow water, in either case Vit being often necessary to remove therudder.

rllhe-object of this invention, therefore, is to overcome theseobjections by dispensing entirely wi h a submerged or other rudder; bymounting 'the device on a horizontally swinging platform adapted to beoperated manually and within a prescribed arc, whereby the propellerblades may be, shifted to either right or left that the boat may belike- Wise directed', or to a neutral position or radius-that the boatmay be driven directly ahead. I

@ther advantages andimprovem'ents Will hereafter appear.

ln thedrawings accompanying this speciis an elevation of the deviceattached to the stern of a boat looking toward the propeller blades.lFig. 2, is a side elevation of the device'attached to a boat, a`

fragmentary portion of the latter, only, being shown. ig. 3 is a planview of the same. Fig. 4, is a horizontalsectional view of a detail,taken on line tf-4 of Fig. 2. v

Referring now to the letters of reference placed upon the drawingsdenotes a suitable prime mover -or motor, preferably an internalcombustion engine. n

B, is a platform horizontally adjustable,

` 4upon whichthe engine rests and to which it is secured.

9B', is a stublshaft, preferably integral ,with the platform, journaledin a tilting frame 'C,'in turn pivoted at c, to a detacha-l ble-clampingdevice D, adapted to be engaged to the stern of a boat.

` lF, is an arm secured to the stub shaft B", formanually'swinging theplatform B, to which the motor is secured.

f, f, are stops carried by the tilting frame to limit the swingingaction of the arm F.

Gr, is a suitable bearing carried by the tilting frame to receive the'thrust of the downwardly extending stub shaft B', projecting from theswinging platform.

H, denotes a plurality of holes in the side Aof the tilting frame C, toreceiveand co-act with a removable bolt H', carried by the clampingdevice D, whereby the tilting platform may be adjusted within apre-determined degree and secured in its adjustedpo- ,sition againstaccidental release, should the angularity of the boats stern to which itis clamped, make this course necessary. llt being obvious that bytilting the platform the propeller may be adjusted to a substantiallyvertical position, producing greater elli ciency in operation.

l indicates the engine propeller shaft, and l', are lpropeller bladescarried by the shaft.

J, denotes an annular guard frame encircling the path of the propellerblades I. K, indicates a wire fabric Secured to the annular frame Atoprotect the occupants of the boat from injury through accidental contactwith the revolving blades.

' L, indicates the fuel tank, and L', the

usual carbureter.

Having indicated the several parts by reference letters the constructionand operation of the device will be readily understood. When it isdesired to drive the boat straight ahead, the horizontally swingingplatform, upon which the engine is mounted is manually adjusted bymeansiof the arm F, so that the propeller shaft is in line with the keelof the boat, it being obvious that the propeller blades mounted on theshaft will then be in a position to drive the boat straight ahead. Tosteer the boat either to the right or left, it is only necessary toadjust the platformv carrying the motor, so that the propeller bladeswillbe shifted either to the right or left'according to the directionthat it may be desired to take. ln

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p order that the device-may not be turned to propell y the tilting'frame upon which the prime mover is mounted, and means for manuallyadjusting the platform whereby the ahead or to the right or left as maybe required. l

2. In a device of the character described,

In La device of the character described,.

er may be swung to drive the boat' a prime mover, a propeller shaftoperated by the prime mover, an air propeller carried by the shaft, aclamping devicel adapted to.

engaged tothe stern" of a boat, a tilting frame pivoted to the clampingdevice, means for securing the tilting framewhen adjusted, a swingingwardl f the ti ting frame, a suitable thrust bearing for the shaftcarriedby the tilting frame, an arm secured tothe stub shaft formanually swinging the platform, and a pair of spaced abutments carriedby the tilting frame for limiting the swinging action of the platform.

In testimony whereof, I cation in the presence of two witnesses.

CHARLES EDWARD RIEDEL. i

\ IVitnesses':

SAMUELE. THOMAS,

GRACE KYLE.

Iplatform havlng a down-l extendmg stub shaft journaled inl sign thisspecifi-y

